WILLIAM J. FOX. i 



posterior surface of middle segment depressed, hounded laterally by a strong 

 ridge converging above; within the space marked by these ridges the surface 

 bears five or six transverse, ratlier regularly placed folds, which are separated 

 medially by a longitudinal furrow; sides of middle segment rugose, abdomen 

 ovate, robust; i)etiole stout, distinctly widened posteriorly, perhaps somewhat 

 longer than hind femora. Length 8 mm. 



New Jersey. One specimen. The sculpture of the posterior sur- 

 face of middle segment and densely pubescent face and clypeus 

 readily distinguish this species. 



6. Fseii mixtus n. sp. 



9. --Head very closely, though distinctly punctured, the occiput and front 

 especially, striato-puuctate ; clypeus and face without long pubescence, covered 

 with a thin silvery gray pile, the clypeus obtusely bidentate ; dorsulum with 

 strong separated punctures, closer and finer anteriorly, the mesopleurse finely 

 striato-puuctate throughout; middle segment with a large basal area, which bears 

 both oblique (laterally) and transverse (apically in the middle) rugje ; poste- 

 rior surface rugoso-reticulate. depressed medially, not bounded by outer ridges 

 laterally; sides with coarse striae or folds: legs black, calcaria yellowish; ab- 

 dominal petiole slenderer than in niger or regidaris, not much widened apically, 

 about as long as hind femora. Length 7.5-9 mm. 



%. — Antennae elongate, slender, not pale beneath; head sculptured as in 9; 

 dorsulum distinctly punctured, but more finely, the sculpture of mesopleurae also 

 finer; middle segment indistinctly bounded by a lateral ridge; abdominal petiole 

 as in the 9 • the petiole much more robust than in the % of cylindricus. as is, in 

 fact, the whole insect. Length 7 mm. 



Washington ; Moscow, Idaho, (Aldrich) ; Mt. Hood, Oregon ; 

 California. Four female and twelve male specimens. The closely 

 punctured head separates this species at once from its allies. A series 

 of males from Mt. Hood are apparently slenderer, with legs brownish, 

 but can hardly be separated as a species. One male specimen has 

 tlie first recurrent vein interstitial with the first transverso-cubital 



7. I'sen leucopus Say. 



Psen leacopiis Say, Boston Journ. Nat. Hist, i, 370, 9 'S < 1837; LeConte, 

 Complete Writings Th. Say. ii. 753, 1859. 



Psen leacopus Packard, 1. c, p. 398. 9 % , 1867. 



Psea eJongutui Packard, 1. c, p. 400, % [nou 9]- 

 9. — Head with distinct separated punctures, the front distinctly striato-punc- 

 tate ; face and clypeus with a thin silvery gray pile, the clypeus obtusely biden- 

 tate; dorsulum with distinct .separated punctures, the mesopleurse apparently 

 very finely striated and with sparse shallow punctures, the strite seemingly ab- 

 sent medially ; middle segment with a large triangular enclosure drawn out into 

 a furrow behind, and with a smaller triangular smooth area in the middle, on 

 each side of which there are five or six coarse oblique folds; remainder of mid- 

 dle segment rugoso-reticulate, on the sides coarsely striated, the posterior surface 

 distinctly depressed medially, and indistinctly bounded by lateral ridges; ab- 



TKANS. AM. ENT. SOC. XXV. JANUARY, 1898. 



